Manufacturing method for cylinder head

A manufacturing method for a cylinder head comprising:

• a preparation step for preparing a cylinder head material having in a common plane a matching surface with a cylinder block and a wall constituent surface of an engine combustion chamber, wherein the wall constituent surface has port holes that correspond to an intake port and an exhaust port, and a slant hole for an engine-related part that is different from the port holes and slants from a vertical direction of the matching surface with the cylinder block;
• an attaching step for attaching the cylinder head material to a masking member that is configured to mask a non-film formation area of the wall constituent surface and the matching surface with the cylinder block;
• a film formation step for, after the attachment of the masking member, injecting film material particles in a direction opposed to the matching surface with the cylinder block to form a heat shield film;
• and
• a detaching step for detaching the masking member from the cylinder head material after the formation of the heat shield film,
• wherein the masking member comprises:
• a matching surface mask portion that is configured to mask the matching surface with the cylinder block;
• port hole mask portions that are configured to link to the matching surface mask portion directly and to mask each of openings of the port holes;
• and
• a slant hole mask portion that is configured to link to any one of the port hole mask portions directly and to mask an opening of the slant hole.